I get the following build failure with 1.1.99.3 on Debian Sid (in particular version 0.44-3 of libical. At first I thought this might be related to new strict gcc rules for linking, but severak ical libs seem to be there. Looking at ical.h, I see only a libicalmemory_strdup, rather than ical_strdup. libtool: link: g++ -I/usr/include/gnome-keyring-1 -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I./gdbus -I/usr/include/dbus-1.0 -I/usr/lib/dbus-1.0/include -g -O2 -uSyncEvolution_Module_Version -Wl,--export-dynamic -o syncevolution syncevolution-syncevolution.o syncevolution-CmdlineSyncClient.o syncevolution-AddressBookSourceRegister.o syncevolution-EvolutionCalendarSourceRegister.o syncevolution-EvolutionContactSourceRegister.o syncevolution-FileSyncSourceRegister.o syncevolution-KCalExtendedSourceRegister.o syncevolution-MaemoCalendarSourceRegister.o syncevolution-QtContactsSourceRegister.o syncevolution-SQLiteContactSourceRegister.o syncevolution-WebDAVSourceRegister.o syncevolution-XMLRPCSyncSourceRegister.o -pthread -pthread backends/addressbook/.libs/syncaddressbook.a backends/evolution/.libs/syncebook.a -lebook-1.2 backends/evolution/.libs/syncecal.a -ldl -lecal-1.2 -lical -licalss -licalvcal -ldbus-glib-1 backends/file/.libs/syncfile.a backends/kcalextended/.libs/synckcalextended.a backends/maemo/.libs/syncmaemocal.a backends/qtcontacts/.libs/syncqtcontacts.a backends/sqlite/.libs/syncsqlite.a backends/webdav/.libs/syncdav.a backends/xmlrpc/.libs/syncxmlrpc.a /build/bremner-syncevolution_1.1.99.3+ds1-1-amd64-pCqsd2/syncevolution-1.1.99.3+ds1/src/syncevo/.libs/libsyncevolution.a syncevo/.libs/libsyncevolution.a -ledataserver-1.2 /usr/lib/libxml2.so /usr/lib/libgconf-2.so -lsynthesissdk -lsynthesis -lsmltk -lsoup-2.4 /usr/lib/libgio-2.0.so /usr/lib/libgmodule-2.0.so -lopenobex /usr/lib/libbluetooth.so /usr/lib/libgobject-2.0.so /usr/lib/libgthread-2.0.so -lgnome-keyring gdbus/.libs/libgdbus.a /usr/lib/libglib-2.0.so -ldbus-1 -lpthread -lrt -pthread backends/evolution/.libs/syncecal.a(syncecal_la-e-cal-check-timezones.o): In function `syncevolution_check_timezones': /build/bremner-syncevolution_1.1.99.3+ds1-1-amd64-pCqsd2/syncevolution-1.1.99.3+ds1/src/backends/evolution/e-cal-check-timezones.c:301: undefined reference to `ical_strdup' /build/bremner-syncevolution_1.1.99.3+ds1-1-amd64-pCqsd2/syncevolution-1.1.99.3+ds1/src/backends/evolution/e-cal-check-timezones.c:325: undefined reference to `ical_strdup'